Hi,
We've been battling with issues regarding the HW connectivity for our K66-based boards for a few days now. While most (if not all) technical documents from NXP mention the need to have at least one of the VREG_IN pins connected to 5V, the FRDM-K66F board seemed to do without this. Notice the J16 having the DNP notation and searching fro VREGIN_K66 in the schematic returns nothing else besides this. However, I measured both sides of J16 and they both have 5V, so it seems the schematic is wrong.
More importantly, what should the USB connections be, for a device that's going to be self-powered and never act as a host? (We're using USB1 High Speed).
Thanks!
Hi Alex
The dots under the jumper means that there is a short circuit between the pins as default, which is designed to be cut if needed and a real jumper (not mounted by default) soldered in.
If you look at the bottom of the board you will see a number of such 0.1" spaced jumper holes connected together - the shorting tracks are not covered with mask and so are golden in color.
Regards
Mark
Hi Alex
The dots under the jumper means that there is a short circuit between the pins as default, which is designed to be cut if needed and a real jumper (not mounted by default) soldered in.
If you look at the bottom of the board you will see a number of such 0.1" spaced jumper holes connected together - the shorting tracks are not covered with mask and so are golden in color.
Regards
Mark
